Mega Update!
1st things first: I am posting from the new MATX Pro, so you should already see that as good news. Now I'll recap some of the things I went through and post I think 20 pictures of the build process. I had hoped for more pics, but it does become something you forget to do while you are actually working on something.
So yesterday (Saturday, March 22nd) I got a package from Laserhive in the post. This is the last thing I was waiting for, so it's time to begin! I masked off the whole back of my case with blue painters tape to guard it from scratches in case my Dremel went all 1-man-fire-hose (out of control). I then placed the custom (and NICE, thanks David @The Hive :D ) rear I/O plate onto the case, lined up where it needed to go, and marked the outside of the plate with pen.
I then marked where I would actually be cutting with a black pen, then a green pen, and finally a marker (outlined in red because my flash washed it out). Yes, I marked it thre...

Thanks for the input, guys. The local Lowes sells a Drenel with a ton of attachments, including 10 of the reinforced cutoff wheels, so I'll probably just be going with that. It's only a 5 minute drive, so if I do end up needing better/more discs, it won't be an issue.
Also, I have been seriously considering dual booting OSX and Win7. I know that my ATI 7870 isn't supported, but the Intel 4000 video should work under OSX, right?
Obviously the BEST case scenario would be if Apple put out support for the 7-series, but if I can get OSX to not see my PCI video card and go with the inboard stuff... I have multiple inputs for my monitor, so switching it over isn't a problem.
I do not have a Mac in which to prepare a disc for a Hackintosh build, more study is required. Feel free to drop some knowledge bombs on me if you have some. Stayed up until 4am reading over guides and feel more confused than I did before I began reading. :S
Ohhh, last bit of news: NewEgg is...

Amazon was my first choice, I am also a Prime member, but when I was pricing the same parts on Amazon (with Prime eligibility) I was closer to $900.
I figure I won't have the cable for at least a few more days, and the rear I/O panel for at least another week, so having the free shipping (and $100 less price tag) is better, even if it takes a bit more time.
I originally wanted to get the Laserhive stuff first, followed by the PC hardware, and the cable last. Looks like I'll get it in the opposite order.
Also, not yet listed above is the front fan bracket that I am getting from Laserhive as well. 2 x120mm fans and I don't have to try to figure out the best way to mount them? Yes please. Still working out where to put my mass storage drives, and the SSD, but that will most likely change when the parts all show up.
I feel the need to say that my wife is being increasingly awesome with this project. What started as me upgrading my existing PC for $500...

You guys hijacked my thread!
Anyhow, UPDATE:
I just dropped $798.40 at NewEgg (with shipping) for all of my internals. Going with a red color scheme, which I didn't think I would ever care about, but for some reason I do. All cables, fans, RAM... It's all got to be black, silver, or red. MIGHT have to try out some sleeving, but I don't want to rip the connectors off of a new PSU (yeah, I void warranties, but not typically the first day).
So, I've got everything ordered (fingers crossed) and on the way. I'm betting that the MOBO tray and rear I/O panel from Laserhive will take the longest to get here, but that's just because I ordered it last Friday.
I am officially excited again! Can't wait to start actually building instead of just planning and shopping (and shopping, and shopping, and planning, and shopping....). I am giving myself 2 weeks after I receive all of my parts to have it all put together and working (I didn't say "fin...

Good news & Bad news:
Good: I was talking to my wife about watercooling and she said it would look stupid (even though the side panels would be on?), so I showed her the "Gunmetal G5" on G5modders and she REALLY liked it.
Bad: I have an extra $100 added to my budget for watercooling, so I'll probably get one of those H80 CPU coolers. Why is this bad? She's going to expect it to look like the Gunmetal G5...
Arghhhhh.